"In our checks with industry and channel sources, we believe Mac sales are coming in ahead of expectations," the analyst said in a research note released to clients. "We believe that Apple is benefiting from a strong back-to-school period where students need a personal computer today, and Macs remain the preferred PC platform for managing documents, music, photos, and videos."

Wu also said iPod nano sales are good but not great. It looks like the black iPod nano players are selling well while the white ones are lagging behind. He heard from his sources Apple really underestimated the demand for the 4GB black iPod nano and they are now realigning their supply to meet this demand dynamic. More details over at Apple Insider.